Thank you for visiting RF Cafe!

Your RF Cafe
Progenitor & Webmaster

Click here to read about RF CafeView the YouTube RF Cafe Intro VideoKirt Blattenberger
BSEE
KB3UON
EIEIO

Carpe Diem!
(Seize the Day!)

5th MOB:
My USAF radar shop

Airplanes and Rockets:
My personal hobby website

Equine Kingdom:
My daughter Sally's horse riding website

RF Cafe Software

Calculator Workbook
RF Workbench
Smith Chart™ for Visio
Smith Chart™ for Excel
RF & EE Symbols Word
RF Stencils for Visio

Day in Engineering History Archive - June 30

June 30

1879: The California Electric Light Company was organized in San Francisco, becoming the first electric company formed to produce and sell electricity. 1908: An unexplained explosion in Tunguska, Siberia knocked down trees in a 40-mile radius and knocked people unconscious 40 miles away. 1918: Francis Stanley, famous for his Stanley Steamer automobile, died. 1930: The first round-the-world broadcast from the U.S. used a series of short-wave radio relays and took one-eighth of a second. 1946: The first atomic bomb dropped from an airplane over water occurred over the Bikini Atoll onto a target group of 73 scrapped ships. 1948: The invention of the transistor was announced by Bell Laboratory. 1948: The first telephone recording devices were authorized for public use in the U.S., and required a periodic "beep" to alert the users. 1953: The first Corvette rolled off the Chevrolet assembly line (it sold for $3,250). 1961: Dr. Lee de Forest, inventor of the Audion tube, died. 1971: Three cosmonauts aboard Soyuz 11 were found dead inside their spacecraft after it had returned to Earth. 1972: The first leap second time correction was added. 1997: China resumed sovereignty over Hong Kong.

| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |

Note: These historical tidbits have been collected from various sources, mostly on the Internet. As detailed in this article, there is a lot of wrong information that is repeated hundreds of times because most websites do not validate with authoritative sources. On RF Cafe, events with hyperlinks have been verified.
Please submit significant historical events and dates for inclusion in these lists. I will be glad to include your name and birthday. Please do not submit your death date ;-) A couple years ago, I began commemorating the birthdays of notable people and events with special RF Cafe logos. Where available, I like to use images from postage stamps from the country where the person or event occurred.
Copyright 1996 - 2016
Webmaster:  Kirt Blattenberger, BSEE - KB3UON

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.